Oscillatable bark-removing jet having variable amplitude of oscillation



Feb. 19, 1952 E. c. SHAW 2,586,727

; OSCILLATABLE BARK-REMOVING JET HAVING VARIABLE AMPLITUDE OF OSCILLATION Filed May 22, 1950 2 Sl-IEE'1 S--SHEET l WWW Mme/mag Feb. 19, 1952 E, c, SHAW 2,586,727 OSCILLATABLE BARK-REMOVING JET HAVING VARIABLE AMPLITUDE OF OSCILLATION Filed May 22, 1.950 2 SHEETS-SHEET 2 WM G/wmX 1- Patented Feb. 19, 1952 OSCILLATABLE BARK-REMOVING JET HAV- ING VARIABLE AMPLITUDE OF OSCILLA:

TION

Ernest 0. Shaw, .Milwaukee, Wis., assignor to Allis-Chalmers. Manufacturing Company; Milwaukee, Wis.

Application May 22, 1950, Serial No. 163,493

This invention relates to devices for cleanin and removing'bark from timber by means of a high pressure hydraulic jet. More specifically, this invention relates to that type of hydrauiic barker in which an oscillating motion is imparted to the barking jet as timber is conveyedthrough the machine. The principal object of the invention is the provision of new and improved barking devices. I:

"To be economically successful a hydraulic barking machine'must remove the bark and foreign material from the surface of the log effectively, economically, and at high speed. 'Ihe oscillating nozzle type barker was developed to achieve faster barking;- In the usual barker of this type the nozzle oscillated about an axis'in a plane parallel to'the longitudinal axis of the log being barked with the nozzle jet axis oscil lating in a plane perpendicular to the-axis of oscillation.- The effectiveness of this type of nozzle however was rathenlimited ,s'ince met from such a nozzle will glance off the log will not be able to contact the entire 1 80? of'the logs circ'umference exposed to a single nozzle;

It was therefore necessary to either provide an undesirable number of nozzles spaced about the log'or to rotate the1log',inorder that'th ets' be. brought to bear on the entire peripheral sur-f face of the log. A furtherdevelopment was the nozzle structure in which the nozzle'joscillates about an axis parallel to the. nozzle j et' axis, with the axis of oscillationj in' a plane perperi-i dieular to the surface ,of the log'being barked.

This type of barking device is, described and claimed the pending ap plication of Fred V. Sam N; 153,.702i" This developmentyadded gre er j efiectivenessito the high speed ljachieved' by 'the oscillation of th'ejnozzle in that a single" nozzlecouldreach 180 "ofthe'peripheral sur face of 'alog thus making it possibleto barkthe entire surface of'a nonrotating'log by using only two nozzles. It is the nature or the prese' vention'toprovide novel means for adillstirig't mentioned types of oscillating nozzles, to increa the economy of operation by limiting nozzle lation to the effe'ctiireangle and reduce the waste dfienergyl that occurs'by the jettraveling bey, r d; the edge "oiover'theto'p' of'th'e 102s being barked? 5 17 Claims. (01. 144-208) ii the invention proceeds.

Accordingly, it is a primary object of this invention to provide a machine that will result in greater speed; effectiveness and economy in 1 utilizing a. hydraulic jet to remove bark and all foreign matter from timber in the preparation for further processing as lumber or pulp.

of varying diameter.

Still another object of this invention is to provide'a'machine in which the amplitude of an oscillating hydraulic jet may be automatically adjusted, While the machine is in operation.

' Objects and advantages other than those above slet 'forth will be' apparent as the description of The novel features of the invention and how the-objects are' 'at tained will appear from the specification "and: the accompanying drawings showing an embodiment of the invention and forming apart .of this application, and all of these novel" features are intended to be pointed out in the claims.

' In the drawingsz,

Fig.1.isaside view. ofa barking machine to; cording. to the present invention with part, of the covering structure cutaway to more clearly disclose the various mechanisms included in the machine;

end covering structure removed;

vFig. 3 is a cross sectional view taken on plane IlI. -III of Fig. 1;, and

"Fig. 4 is a schematic diagram of anautnmatic control system for the barking machine of Figs.

1, 2 and 3.

2, the barking machine comprises conveying means I for receiving and carrying a log endwise amplitude of oscillation of {either of' the-above;

through the machine, nozzle assemblies 2, reciprocating driving means 3 for imparting an oscil-i lating motion to the nozzle assemblies 2, and.

fluid supply means 4 for supplying hydraulic casing '5 encloses the machine to prevent water and chips of bark escaping to the surrounding atmosphere and also to support elements suspended above the conveying means I.

The conveying means I are herein shown as comprising V type log carrying rolls 6 with -a; shaft 1 extending from each side of the rolls 6 and supported by brackets 8. The rolls 6 may] be driven byany suitable means, here shown as the motor 9, in any combination of driven and idler rolls desired, to transport the logs through the machine. The nozzle assemblies 2 are shown mounted on-abase-member l2 on each side of the rolls 6. The nozzle assemblies'2 include'flexible fluid transfer means here shown as the flexible fluid couplings I3. The couplings 13 are mounted on the base members l2 with their turning axis in a plane that'isperpendicular'to the longitudinal axis of a log on the rolls 6. Jetissuing means, here shown as a conduit member IS with a nozzle l6 attached thereto, are-con nected to the movable portion of "each of the flexible fluid couplings l3.

the reciprocating driving'means 3 as will more fully appear as the'description of the invention proceeds.

L-shapedstructurewhich, if stationary, would direct a barking jet toward the log and along an.

axis parallel to the turning axis'of-t'he coupling l3, that is, the nozzle jet axis of each of the nozzles 16 parallelsthe axis of oscillation at any position on thearcuate path traveled by each oscillating nozzle. This type of oscillating nozzle assembly is more fully described and claimed in the copending'Sams application s. N. 153,702.

The means provided to oscillate each of the conduit members 15 about the turning axis of theirrespective couplings l3, includes anexternally screw threadedshaft member I1 connected to the nozzle assembly "2 by means or a cy1indrical arm I8 attached to the movable portion of The couplings l3 serve the nozzle assemblies 2 both asfluid supply 7 fittings and as the fulcrum for'the oscillating motion imparted to the conduit members l by- The conduit I5 and nozzle l6form an the headers 46 tothe nozzle-assemblies 2.

the structure describecl, that is, ata 90 angle to the conduitmembers l5, will' result in a considerable reaction to the force of the jets which would tend to bend the conduit members away from the log being barked. This would result in-breaking the conduit members l5 or at least cause the'jets tostrike the log at a less effective angle. Bracing means are therefore provided to eliminate .the possibility of the conduit members l-5 breakingorbending away from the log.

The bracin'g 'means are shown as a brace plate 38 mounted one base 39. A shoe 40 with bearings II is attached to each conduit member l5 tovrideo'n the brace plates 38 and thereby brace the conduit members I5 against the reaction of .the 'jets with aminimumcf frictional resistance between'the shoes wand-the brace .plates .38.

The fluid supply means 4 for delivering high pressure -fluid to "the' nozzle assemblies 2 comprises a fluid isupply pipe with headers 46 extending 'to each side LOflithe conveying means I. Delivery tubes llflltransmit the fluidfrom .The tubes 41, 48 deliver hydraulic fluidtob'othsides oi the "flexible fluid couplings |3 to balancethe the coupling l3. Referring now also to Fig.-3, the

externally screw threadedshaft His mounted concentrically within the cylindrical arm 18. An internally screw threaded member 2| is mounted concentrically about the externally screw threaded shaft l1. A crosshead member 22 is slidably mounted about the cylindrical arm l8 :and is. bolted to a flange 23 of the internally screw threaded member 2! that extendsthrough a slot 24 in the cylindrical arm l8. A connecting arm 25 is attached on one end to theic'ros'shead'member 22. The other end of the 'connecting armforces on'the couplings and thereby enable them to oscillate without binding or causing excessive wear.

In ithe operation o'fthev barking machine as hereinbefore described logs of varying: diameter are received and carried. in the :crotch ofthe rolls 6. Small-logs will ride a little deeperin the crotch ofthe rolls than large logs, butthis variation will be slight. The principal variation will be inthe level of vthetop of the logs above the 25 is attached to'a crank arm "26 which is mounted on 'anadlacentend of "a Shaft'fl that;

extends across the top of the casing 5 andis supported by the brackets 28, 29 mounted ontopof I the casing 5. The shaft 2'! and crank arms 2,6-

attached thereto are'shown as being'rotatedby f an electric motor 30 also mounted 'on top'of the casing 5. The rotational motion of the shaft 21 is thereby converted to the 'reciprocatingmotion of "the "connecting arms 25 Which, bein connected to the "cylindrical 'arms 18, cause the flexible couplings iii to oscillate and the barkingjets to oscillate transverselya'crosseach side or the log. A 'teleoperated reversible electric motor 3| is mounted on each 'ofthebylindrical' arms l8 to rotate'theexternally screw threaded shaft l'l'mounted within the'cylindrical arm' l8. Rotating the externally'screw threadedshafts I! will move the internally screw threaded membars '2 I andthe crosshe'ad members '22 either tosupporting rolls. The described oscillating mechanism may beadlusted to change-the upper limit of the-nozzle travel while leaving the lower limit of travel-substantially unafiected. That is, the

externally screw threadedshafts I! may be rotated bythe reversible motors ill-to move the crosshead niemb'ers 22 closer to the turning axis of "the couplings T13. to thereby "reduce" the effective length "of 'thelcylindrical arms l8 1 in the link- 'ag'e 'fromxthe driven crank arms 26and thereby raise the upper limit of nozzle lfi travel. Similarly, rotating the externally screw threaded shafts ll in the opposite direction will move the crosshead members'22 fartheriaway from the turning axis of the couplings l3 thus increasing the effective length of the cylindrical arms 18 in the linkage Jfrom the driven crank arms 26, soias' to lower the upper limit of nozzle travel. Theafores'aid adjustment may be made without stopping the-machine. "Energiz'ation of the motors 3 lmay" be controlled by an operator from a remote position that enables him to observe the effective limit'of nozzle-travel so that he may keep the overthrow of water over the top'of the logsto aminimum'and yet allow'the jets to completely'ccverthe log being barked.

'It is desirable, howeventolkeep the number of operating personnel to a minimum. Means are therefore provided for complete automatic v Asshown in Fig. -1 and Fig. 2 the feeler means comprise a feeler member mounted above the rolls 6, on a rotatable shaft 52 extending through both sides of the casing 5. The free swinging end of the feeler member 5| will, due to its own unbalanced weight, ride upon the top of a log as the log passes beneath the feeler member. As the feeler member 5| drops from a large log to a smaller log or is pushed up by a log larger than the one preceding it, the swinging motion of the feeler member will-rotate the shaft 52. Adashpot 53 is mountedv on top of the casing 5 and is connected to the feeler member 5| to prevent the feeler member dropping with a force sufiicient to cause damage to-thefeeler means.

Circuit completing means here shown as a pair of normally open, switches 56, 51, are attached to one end of the shaft 52 andyare operated in a manner hereinafter described in greater detail withreference to Fig; 4.. to control the energize.- tion of themotors 3 It maybe generallv stated however that either of the switches 55, 51, when closed, will ope ate to energi e the motors 3| to rotate the shafts 1, to therebv move the crosshead members 22 relative to the turn ng axis of the couplings l3. When the feeler member 5| is raised. switch 51 will be closed and the motors 3| will be energized to move the crosshead members 22 toward the couplings 3. Similarly, when the feeler member 5| is lowered, switch 56 will be closed, and the motors 3| will be energized to rotate in the opposite direction to move the crosshead members 22 away from the couplings 3. scribed later in detail with reference to Fig. 4, allows the motors 3| to move the crosshead member to the position appropriate for the size of the log being barked, and then interrupts the circuit. The followup system includes a transmitter66 mounted on one of the motors 3| and driven in-any desirable manner to turn with the motors 3|. A receiver 6|, energized by the transmitter 66 is mounted on the casing 5 to coop- A followup s stem also de---'" erate with the switches 56, 51 to open the switch that has been closed by the mo ement of the feeler member 5|. when motors 3| have moved the crosshead members to their new position."

The details and operation of the automatic control system may be more easily explained by referring to the schematic diagram shown in Fig. 4. A source of alternatin current 62 is provided to energize the motors 3| to rotate the externally screw-threaded shafts I1 and position the crosshead members '22. A transformer 63 energized from source 62 supplies a rectifier 64 to provide direct current for energizing the.

isslidably mounted within the switch and pro jects from either side of the switch- The-receiver 6| includes pairs of stator field coils H |2 and a permanent magnet rotor-13. The rotor |-3 of then-receiver 6| is connected by asha-ft 14 tops 6 switch actuating arm 15 mounted between the switches 56, 51. A pair of normally open solenoid switches I6, 11 are provided to control the connection of -motor.. 3| to source 62 for either forward or reverse operation of the motor. When switch 56 is closed switch 11 will close to rotate the motors 3| in one direction and when switch 51 is closed switch 16 will close to rotate the motors 3| in the opposite direction. A pair of limit switches 18, 19 are provided-limit switch 18 in series with switches 56 and I1, and limit switch 19 in series with switches 51 and 16 to limit the travel of the crosshead members 22 on the externally screw threaded shafts ll.

The transmitter 60 comprises a single resistor having its terminals connected with the rec-. tifier 64, and brushes 8| connected in any suit able manner to rotate upon rotation of the motors 3|, engageable with different portions of the resistor 80 at selected positions. The brushes 8| are connected to the coils 7|, 12 of the receiver 6| to thereby cause the rotor I3 of the receiver 6| to rotate with the brushes 8| of the transmitter 60.

In the operation of the described machine when a log of decreasing diameter or a log of smaller diameter than the log preceding it passes beneath the feeler member 5|, the feeler member will swing in a downwardly direction and the shaft 52 will rotate clockwise.

switches 56, 51 in a clockwise direction about the axis of the shaft 52. When the shaft 10 of the switch 56 comes in-contact with the actuatingiarm 15 the spring 69 will be compressed and the contact member 68 will bridge the contacts 6'! and complete the circuit through the limit switch 18 to close the solenoid switch 11.

When the solenoid switch 11 is closed, the motors 3| wlil rotate the externally screw threaded shafts IT to cause the crosshead members 22 to move away from the couplings l3, to the left as shown in Fig. 1 and Fig. 4, to lower the upper limit of oscillation about the couplings I3. As the motors 3| and shafts I1 rotate, the brushes 8| of the transmitter 66 will also rotate, counterclockwise as shown, and impress a voltage on the windings ll, '12 of the receiver 6| that will cause the rotor 13 of the receiver 6| to also rotate counterclockwise and move the arm 15 away from the switch 56. As long as the feeler member 5| continues to swing downwardly the switch 56 will follow the arm 15 keeping the spring 69 compressed and the switch 56 in a closed position. When the feeler member 5| stops swinging downwardly the arm 15 will move away from the switch 56 and the spring 69 will open the switch 56 stopping the motors 3| and the travel of the crosshead members 22. The rotation of the motors 3| and shafts would also be stopped by the crosshead member 22 moving to open the limit switch 18. if the diameter of the log bein barked would be increasing or a log of larger diameter than the log preceding it would pass beneath the feeler member 5| the feeler member would swing upwardly and rotate the shaft 52 counterclockwise. The counterclockwise rotation of the shaft 52 would then rotate the switches 56, 51 in a counterclockwise direction about the shaft 52 and switch 51 would close. The solenoid switch 16 would then close and the motors 3| would rotate the shafts I! to move the crosshead members 22 toward thecouplings l3, to the right as shown in Fig. "lzzand Fig. 4, to'raisethe upper-= The clockwise rotation of the shaft 52 will also'rotate the- Similarly,

limit of oscillation about the couplings 13. The

transmitter 60 would then cause the receiver Bl to rotate the arm clockwise to allow the switch 51 to openas soon as the feeler member 51 stopped its upward swing, indicatin that a length of the log of constant diameter was being barked. The limit switch 19 would prevent the crosshead members 22 being moved too close to the flexible couplings I3. An overload circuit breaker 82 may be provided to disconnectmotor' 31 from source 62 upon occurrence of excessive currents in the motor circuit.

If the operating personnel should desire to manually control the upper limit of the jet"; travel, the feelermember 5| could be removed and the shaft 52 rotated manually by anymeans such as a handwheel. The automatic control system could also be immobilized without removing thefeeler member 5| by merely providing switch means to interrupt the flow of current to the: motors 3| from the source 62. The motors 3| could then be energized from any other source of current manually controlled in any manner desired.

From the foregoing, it will be apparent to those skilled in the art that the illustrated embodi: ment of the invention provides a new and improved hydraulic barking device flexible in' the operation thereof to the particular needs and de sires of the operating personnel and, accordingly, accomplishes the objects of the invention. On the other hand, it will also be obvious to those skilled in the art that the illustrated embodiment of the invention may be variously changed and modified, or features thereof, singly orcollectively, embodied in other combinations than herein illustrated, without departing from the spirit of the invention, orsacrificing all of the advantages thereof, and that accordingly the disclosure herein is illustrative only, and the invention is not of oscillation of'said jet mounting means while I said oscillating means is in operation.

2. A nozzle assembly for hydraulic log barkers, comprising: fluid supply means to deliver hy draulic fluid under pressure; fluid jet issuing means; means mounting said jet means for oscillation about a fixed axis parallel to its jet issuing axis; means for supplying said fluid jetcomprising: fluid supply means to deliver hy-" draulic fluid under pressure; flexible fluid transfer means connected to said fluid supplymeans; jet issuing means attached to said flexible fluid transfer means; an externally screw threaded member connected to said jet issuing means; aninternally screw'threaded member mounted con-'- and means to rotate said externally screw threaded'member to move said internally screw threaded member relativeto said'flxed axis'about which said jet issuing means oscillates, to adjust the amplitude of oscillation of said jet issuing means.

4. A nozzle assembly for'hydraulic log barkers comprising: fluid supply means to deliver hydraulic fluid under pressure; flexible fluid transfermeans connected to said fluid supply means; jet issuing means attached to said flexible fluid transfer means; an externally screw threaded member connected to said jet issuing means; an internally screw threaded member mounted con,-

centrically aboutsaid externally screw threaded member; reciprocating driving means connectedto said internally screw threaded member to escillate said jetissuing means about a fixed axis; an electric motor mounted to rotate said externally screw threaded member; and m'eanscontrolling the energization of said electric motor to rotate said internally screw threaded member and move said internally'screw threaded member relative to said fixed axis about which said jet-is-' suing means oscillates, to adjust the amplitude of oscillation of said jet issuing means.

5. A nozzle assembly for hydraulic log barking machines comprising: 'fluid supply means to de-' liver hydraulic fluid underpressure; flexible fluid transfer means connected to said fluid supply means; jet issuing means attached to said flexible-fiuid transfer means; an externally screw threaded member connected to said jet issuing means; an internally threadedmember mounted concentricallyabout said externally screw threaded member; reciprocating driving means connected to said internally screw threaded member to oscillate said jet issuing means about a fixed axis parallel to its jet issuing axis; and means to rotate said externally threaded member and move said internally'threaded member relative to said fixed axis about which said jet issuing means oscillates, to adjust the amplitude of oscillation of said jet issuing means.

6; A hydraulic lo'g barker comprising: fluid supply means to deliver hydraulic fluid under pressure; conveying means for receiving and carrying a log through said machine; fluid jet issuing means; meansmounting said-jet means in spaced relation about said conveying means for oscillation about a fixed axis; means for supplying said fluid jet means from said fluid supply means; a lever arm connected to said mounting means; means connected to said lever arm for oscillating said fluid jet-mounting means about said fixed axis; and means having a log diameter sensitive feeler element operablyconnected with said lever arm and responsive to changes in log diameter for "changing the effective length of said leverarm in proportion to the diameter changes sensed,

to adjust the-amplitude of oscillation of said jet mounting means while said oscillating means is in operation.

7. Ina hydraulic log barking machine; conveying-means for receiving and carrying logs through said machine; fluid supply means mounted in spaced relation to said conveying means to deliver hydraulic fluid -underpressure; a conduit member attached to said fluid supply means to direct a barking jet of'hydraulicfluid upona log passing through said machine' on said conveying means pan externally screwthreadedmemniountedconcentric to said conduit member; Ian internally screw threaded member mounted lcqncentric'ally "about said externally screw threadedmember; reciprocating driving means Qjconnected to said internally screw threaded member to oscillate said conduit member about a fixed .axis; and means to rotate said externally screw threaded member to thereby make adjustable the -length of the lever arm between said internally --,screw threaded member and the fixed axis about which said conduit member oscillates.

" 8, In a hydraulic log barking machine: convey- .ing. means for receiving and carrying a log .through said machine; .mounted in spaced relation to said conveying --means to deliver hydraulic fluid under pressure; 'a conduit member attached to said'fluid supply means to direct a barking jet of hydraulic fluid fluid supply mea 1;

:upon a log passing through said machine on said 1;

conveying-means'; an externally screw threaded .member mounted concentric to said conduit member; "an internally screw threaded member -mounted concentrically about said externally screw threaded member;":reciprocating driving means connected to said internally screw threaded member to oscillate said conduit member about a fixed axis; feeler means mounted'in spaced re? .lation' to said con-veying means and movable to contact the peripheral top surface of the log passing through said machine on said conveying means; and'means responsive to the position of said 'feeler means to rotate said externally threaded member to move the internally screw threaded member relative to said fixed axis of oscillation and adjust the amplitude of oscillation of the barking jet.

1' "9; "In a hydraulic 'log barking machine: conveying means for receiving and carrying logs through said machine; fluid supply means mounted in spaced relation to said conveying means to deliver hydraulic fluid under pressure; a conduit member attached to said fluid supply means to direct a barking jet of hydraulic fluid upon a log means; an externally screw threaded member mountedconcentric to said conduit member; an internally screw threaded member mounted concentrically about said externally screw threaded member; reciprocating driving means connected to said internally screw threaded member to oscillate said conduit member about a fixed axis; an lectric motor mounted to rotate said externally screw threaded member; and means controlling the energization of said electric motor to rotate said externally screw threaded member to move said internall'y'screw threaded member relative to s'aid fixed axis to control the amplitude of oscillation of the barking jet.

on said conveying means; and means responsive to the position of said feeler means to energize said electric motor to rotate said externally screw threaded member to move said internally screw threaded member relative to said fixed axis to adjust the amplitude of oscillation of the barking jet in accordance with the size of the log being barked as determined by the position of said feler means.

11. In a hydraulic log barking machine: conveying means for receiving and carrying a log through said machine; fluid supply means mounted in spaced relation to said conveying means to deliver hydraulic fluid under pressure; a conduit member attached to said fluid supply means to direct a barkinghjet of hydraulic fluid upon a log passing through said machine on said conveyingl means; an externally screw threaded member mounted concentric to said conduit member; an internally screw threaded member mounted concentrically about said externally screw threaded member; reciprocating driving means connected to said internally screw threaded member to oscillate said conduit member about a fixed axis; a teleoperated motor mounted to rotate said externally threaded member; a normally open electrical circuit for energizing said motor; feeler means mounted in spaced relation to said conveying means and movable to contact the peripheral top surface of the log passing through said machine on said conveying means; and energizing circuit completing means connected to said ieeler means responsive to the position of said feeler means to energize said teleoperated 'motor'to rotate said externally threaded member and move said internally threaded member relative to said fixed axis of oscillation to adjust the amplitude of oscillation of the barking jet in accordance with the size of the log being barked as indicated 7 passing through said machine on said conveying by'the position of said feeler means.

12. In a hydraulic log barking machine: conveying means for receiving and carrying logs through said machine; fluid supply means mounted inspaced relation to said conveying means to deliver hydraulic fluid under pressure; flexible l fluid transfer means connected to said fluid sup- 10. In a hydraulic log barking machine: conveying means for receiving and carrying a log through said machine; fluid supply means mounted in spaced relation to said conveying means to deliver hydraulic fluid under pressure; a conduit member attached to said fluid supply means to direct a barkingjet of hydraulic fluid upon a log passing through said machine onsaid conveying means; an externally screw threaded member mounted concentric to said conduit member; an internally screw threaded member mounted concentrically about said externally screw threaded member; reciprocating driving ply means; jet issuing means attached to said flexible fluid transfer means to direct a barking jet of the hydraulic fluid upon a log passing through said machine upon said conveying means; reciprocating driving means connected to said jet issuing meansto oscillate a portion of said jet issuing means in a plane parallel to the longitudinal axis of the 'log' passing through said machine upon said conveying means; feeler means mounted in spaced relation to said conveying means movable to contact the eripheral top surface of the log passing through said machine upon said conveying means; and means a I responsive to the position of said Ieeler means means connected to said internally screw threaded member to oscillate said conduit member about fixed axis; an electric motor mounted to rotate said externally threaded member; teler means to adjust said reciprocating means to limit the amplitude through which the jet issuing means oscillates.

l3. In a hydraulic log barking machine: conveying means for receiving and carrying a log through said machine; fluid supply means mounted in spaced relation to said conveying means to deliver; hydraulic fluid under pressure; a conduit member attached to said fluid supply means to 1' direct a barking jet of hydraulic fluid upon a log passing through said machine on saidconveying means; an externally screw threaded member mounted concentric to said conduit member; an internally screw threaded member mounted concentrically about said externally screw threaded member; reciprocating driving means connected to said internally screw threaded member to oscillate said conduit member about a fixed axis; a teleoperated motor mounted to 1'0- tate said externally threaded member and move said internally threaded member relative to said fixed axis of oscillation to adjust the amplitude of oscillation of the barking jet; a normally open electrical circuit for energizing said motor; feeler meansmounted in spaced'relation to said conveying means and movable to contact the peripheral top surface of the log passing'through said machine on said conveying means; energizing circuit completing means connected to said feeler means to close said energizing circuit upon movement of said feeler means; and follow up means responsive to the rotation of said motor to keep said circuit completingmeans closed only as long as said feeler member continues to move.

14. In a hydraulic log barking machine; conveying means for receiving and carrying a log through said machine; fluid supplymeans mounted in spaced relation to said conveying means to deliver hydraulic fluid under pressure; a conduit member attached to said fluid supply means to direct a barking jet of hydraulic fluidupona log passing through said machine on said conveying means; an externally screw threaded member mounted concentric to said conduit member; an internally screw threaded member mounted concentrically about said externally screw threaded member; reciprocating drivingmeans connected to said internally screw threaded member to '05- cillate said conduit member about 'a fixed axis; a teleoperated motor mounted to rotate'said 'externally threaded member and move said internally threaded member relative to said fixed axis of oscillation to adjust the amplitude of oscillatlon of the barking jet; a normally open electrical circuit for energizing said motor; feeler means mounted in spaced relation to said conveying means and movable to contact the peripheral top surface of the log passing through said machine on said conveying means: energizing circuit completing means connected to said feeler means to close said energizing circuit ucon movement of said feeler means; a transmitter operated bysaid motor; a receiver connected to said circuit completing means and energized bysaid transmitter to keep said circuit completing means closed only as long as said feeler member continues to move.

15. In a hydraulic log barking machine: conveying means for receiving and carrying logs through said machine; fluid supply means mounted in spaced relation to said conveying means to deliver hydraulic fluid under pressure: a flexible fluid coupling attached to said fluid supplymeans with the turning axis of said coupling being fixed in a plane perpendicular to the longitudinal axis of a log, passing through said machine upon said conveying means; jet issuing means attached to said flexible coupling to direct a barking jet of hydraulic fluid upon the log as it passes through said. machine, the issuing axis of said jet means being parallel to said turning axis; an externally screw threaded memberv connected to the movable portion of said flexible coupling; an internally screw threaded member mounted concentrically about said internally screw threaded member; reciprocating driving means connected to said internally threaded member to oscillate said jet issuing means about saidturning axis of said'flexible' coupling; and

means to rotate said externallythreadedmember andmove said internally threaded memberrelative to said turning axis of said flexible coupling, to adjust the amplitude of oscillation of said jet issuing means.

16. In a hydraulic log barkingmachine: conveying means for receiving and carrying logs through said machine; fluid supply means mounted in spaced relation to said conveying means to deliver hydraulic fluid under pressure; a flexible fluid coupling attached to said 'fluid supply means with the turning axis of said coupling being fixed in a plane perpendicular to-the longitudinal axis of a log passing through said machine upon said conveying-means; jet issuing means attached to'said flexible 'coupling todirec't a barking jet of hydraulic fluid upon'thelog as it passes through said machine, theiissuing axis of said jet means being parallel to said turning axis; an externally screw threadedimember connected to the movable portion ofsaid flexible coupling; an internally screw threaded member mounted concentrically about said externally screw threaded member; reciprocating driving means connected .to said internally threaded member-to oscillate saidjet'issuing means about said turning axis of said flexible coupling; a teleoperated motor mounted to rotate said externally threaded member; a normally open electrical circuit for energizing said motor; feeler means-mounted in spaced relation to :said conveyingmeans and movable to contact the peripheral surface of the log passingthrough .saidmachine on said conveying means; and energizing circuit completing means connectedtto 'saldfee'ler means-responsive to the position or; said feeler means to energize said teleoperated motor'to rotate said externally threadedmember endmove said internally threaded member relative to said turning axis of said flexible coupling to adjust the amplitude of oscillation of the barking jet to correspond to the diameter of the log being barked as indicated by the position ofsaidfeeler means.

17. In a hydraulic log barking machine: conveying means for receiving and carrying logs through said machine; a flexible fluid coupling mounted on each side of said conveying means with the turning axis thereof in a plane perpendicular to the longitudinal axis of a log passing through said machine upon said conveying means; fluid supply means connected to each of said flexible couplings; jet issuing means attached to each of said flexible couplings to-direct sharking jet of hydraulic vfluid upon-a 10g asit-passes through said machine upon said conveyingmeans, the issuing axis 01' said jet means being parallel to said turning axis; an externallyscrew threaded member connected to the movable portion of each of said couplings; an internally screw threaded member mounted concentrically about each of said externally screw threaded members; reciprocating driving means connected to each of said internally screw threaded members to oscillate each of said jet issuing means about the turning axis of their respective couplings; a teleoperated motor mounted to rotate each of said externally threaded members; a normally open electrical circuit for energizing said motors; a feeler member swingably mounted above said conveying means to ride upon the top surface of a log passing through said machine upon said conveying means; and energizing circuit completing means mechanically connected to said 13 feeler member responsive to the position of said feeler member to energize said teleoperated motors to rotate said externally threaded members and move said internally threaded members relative to the turning axis of said flexible couplings to adjust the amplitude of oscillation of the barking jets to correspond to the diameter of the log being barked as indicated by the position of said feeler member riding on the top of the 108.

ERNEST C. SHAW.

REFERENCES CITED The following references are of record in the file of this patent:

Number 14 UNITED STATES PATENTS Name mite Blouin Jan. 31, 1928 Coles Dec. 25, 1928 Frede et a1. Oct. 3, 1933 Swift Dec. 31, 1946 White June 14, 1949 Johnson Mar. 28, 1950 Swift Apr. 4, 1950 Bukowsky May 23, 1950 

